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Guy I knew had a Gibson cat back on his Silverado, that thing sounded mean! I don't know how it sounded on the inside tho.I'm thinking that a Gibson cat back system might work well. I owned, for a short time, a 2002 ZR2 Blazer on which I installed a Gibson cat back. It made the 4.3 engine sound like a Jag on the outside, but was quiet inside the truck.
The full stainless steel system is what I'd go with.
We need a vid!i was tired of my stock exhaust a little while ago so i grabbed a dual to single 3 in y and a cheap thrush welded muffler. welded it in myself to keep price down to keep my wife quiet. i wasn't expecting much but i was thoroughly pleased. nice mellow sound almost cant even hear it on the highway. has a nice rumble when i start the truck and a nice growl when i get on it. since it was a cheap diy when it fails ill probably redo the same setup with but with full pipes instead of just a muffler swap.